Which expresses 9x^2y^2 as a perfect square

a: (3xy)^2
b: 9x
c: 3xy
d: 3x^2y^2

Rectangle pqrs has length a and width 4b. the x-axis bisects ps and qr what are the coordinates of the vertices

What is sin 7x/4 ? i need on this urgent trig

The volume of a cone is 37x3 cubic units and its height is x units. which expression represents the radius of the cone's base, in units? 1 s o 3x o 6x obx 93x2